Radio Shack PRO-106 User manual

PRO-106

Digital Trunking Hand Held Scanner

Catalog Number: 20-106

CONTENTS

Page

Specifications .................................................................................................................................................... 2

Block Diagram ................................................................................................................................................... 4

Alignment and Adjustment ................................................................................................................................ 5

Troubleshooting ............................................................................................................................................... 10

Printed Circuit Board ....................................................................................................................................... 15

Wiring Diagram ................................................................................................................................................ 19

Exploded View ................................................................................................................................................. 20

Mechanical Parts List ....................................................................................................................................... 21

Electrical Parts List .......................................................................................................................................... 22

Semiconductor Lead Identification ................................................................................................................. 65

Microprocessor (IC306) Port Format............................................................................................................... 71

Schematic Diagram ......................................................................................................................................... 72

RadioShack is a registered trademark used by RadioShack Corporation.

20-106

SPECIFICATIONS

Frequency Coverage 25.000-26.960 MHz 10 kHz steps (AM)

26.965-27.405 MHz 10 kHz steps (AM)

27.410-29.505 MHz 5 kHz steps (AM)

29.510-29.700 MHz 5 kHz steps (FM)

29.710-49.830 MHz 10 kHz steps (FM)

49.835-54.000 MHz 5 kHz steps (FM)

108.000-136.99166 MHz 8.33 kHz steps (AM)

137.000-137.995 MHz 5 kHz steps (FM)

138.000-143.9875 MHz 12.5 kHz steps (FM)

144.000-147.995 MHz 5 kHz steps (FM)

148.000-150.7875 MHz 12.5 kHz steps (FM)

150.800-150.845 MHz 5 kHz steps (FM)

150.8525-154.4975 MHz 7.5 kHz steps (FM)

154.515-154.640 MHz 5 kHz steps (FM)

154.650-156.255 MHz 7.5 kHz steps (FM)

156.275-157.450 MHz 25 kHz steps (FM)

157.470-161.5725 MHz 7.5 kHz steps (FM)

161.600-161.975 MHz 5 kHz steps (FM)

162.000-174.000 MHz 12.5 kHz steps (FM)

216.0025-219.9975 MHz 5 kHz steps (FM)

220.000-224.995 MHz 5 kHz steps (FM)

225.000-379.99375 MHz 6.25 kHz steps (AM)

380.000-419.9875 MHz 12.5 kHz steps (FM)

420.000-450.000 MHz 5 kHz steps (FM)

450.00625-469.99375 MHz 6.25 kHz steps (FM)

470.000-512.000 MHz 12.5 kHz steps (FM)

764.000-805.996875 MHz 3.125 kHz steps (FM)

806.000-823.9875 MHz 12.5 kHz steps (FM)

849.000-868.9875 MHz 12.5 kHz steps (FM)

894.000-939.9875 MHz 12.5 kHz steps (FM)

940.000-960.000 MHz 6.25 kHz steps (FM)

1240.000-1300.000 MHz 6.25 kHz steps (FM)

Unit Nominal Limit

Signal to noise ratio (FM and AM)

RF input: 100 μV 25-54 MHz dB 40 30

Dev. 3 kHz at 1 kHz 108-136.99166 MHz dB 40 30

Mod.: 60% at 1 kHz 137-174 MHz dB 40 30

216.0025-299.99375 MHz dB 40 30

300-512 MHz dB 35 25

764-960 MHz dB 35 25

1240-1300 MHz dB 35 25

Squelch sensitivity

at threshold (AM/FM) μV 0.5 2

at tight (FM) dB 25 15

at tight (AM) dB 20 10

Data decode sensitivity

WX Alert 1050 Hz tone 3 kHz Dev. at 162.4 MHz μV 0.3 1

Unit Nominal Limit

Spectrum sweeper sensitivity at 450 MHz dBm -60 -50

Sensitivity

FM: (S+N)/N=20 dB 25-54 MHz μV 0.3 1

Dev.: 3 kHz at 1 kHz 108-136.99166 MHz μV 0.3 1

137-174 MHz μV 0.5 2

216.0025-224.995 MHz μV 0.5 2

225-299.99375 MHz μV 0.5 2

300-405.9875 MHz μV 0.8 3

406-512 MHz μV 0.5 2

764-960 MHz μV 0.7 3

1240-1300 MHz μV 0.7 4

AM: (S+N)/N=20 dB 25-54 MHz μV13

Mod.: 60% at 1 kHz 108-136.99166 MHz μV13

137-174 MHz μV 1.5 5

216.0025-224.995 MHz μV 1.5 5

225-299.99375 MHz μV26

300-405.9875 MHz μV310

406-512 MHz μV26

764-960 MHz μV26

1240-1300 MHz μV312

Selectivity AM 25-27.995 MHz -6 dB kHz ±4 >±2.5

-50 dB kHz ±6 <±12

Other frequency -6 dB kHz ±7 >±4.5

-50 dB kHz ±13 <±18

Spurious rejection (Except Primary image) at 154.1 MHz dB 40 30

Acceptable radio frequency displacement (EIA RS-204D) kHz ±6 ±3

Residual noise Volume control, set to its minimum, squelched mV 1 3

Scanning rate without trunking channels/sec. 55 45-66

Search rate at 162.25-167.25 MHz steps/sec. 90 80-100

Scan delay time sec. 2 1-3

Audio output power 10% THD mW 170 140

Current drain (using AC or DC adapter) Squelched mA 140 170

Working memory 1,800 programmed object using flexible scannable object system

Display Liquid crystal display (16-charactor x 4-line, plus icon)

Receiving system Triple conversion PLL super-heterodyne,

1st IF: 380.8 MHz/2nd IF: 21.4 MHz/3rd IF: 455 kHz

Power source 6V DC negative ground only

4AA batteries or a suitable adapter

Jacks Antenna, earphone, PC/IF, and external power

Dimensions (HWD) 5 3/4 x 2 9/16 x 1 5/8 inches (145 x 65 x 42 mm)

Weight apporox. 8.5 oz. (240 g) without antenna and batteries

Note: Nominal specs represent the design specs. All units should be able to approximate these specifications.

Some units will exceed while some may drop below these specs. Limit specs represent the absolute worst condition

still considered acceptable. A unit should NEVER fail to meet limit specs.

BPF

Attenuator

D1,D2

RF Amp

Q3,Q4

1st Mix

IC2

2nd Mix

2nd IF Amp

Q10

Noise Amp

IC6a

Ceramic

Filter

CF1

AGC Amp

Q11

AM/FM

Switching

IC9a,9b,10a,10d

Pre Amp

IC8a

Mute

IC10b,Q32

Audio Amp

IC12

Voltage

Regulator

IC11

Voltage

Regulator

IC13

Regulator

Switching

IC14

DC-DC

Converter

IC5

AGC Amp

Switching

Q5,Q6

Switching

Band Select

Att. Control

IC1

Switching

Q21

VCO1

Q20

VCO2

Q22

Switching

Q23

Buffer

Amp

Q24

PLL

IC4

Low-Pass

Filter

Q25,Q26

Buffer

Amp

Q30

VCO3

Q29

Low-Pass

Filter

Q27,Q28

LCD Keyboard

CPU

IC307

Voltage

Detector

IC303

Memory

IC301

SAME Data

Filter

IC306c,d

WX Alert Data

Filter

IC306a,b

HiSpeed Data

Filter

IC305a

Low Speed

Data Filter

IC304,305b

Charger

Q33,34,35,36

IC4

3rd IF Amp Noise Amp

3rd Local Mixer

Quadrature Detector

IC7

Buffer Amp

IC8b

VOL

PWR

PC/IF

J301

Ni-cd

Batt

AAx4

DC 9V

Speaker

Power SW

Ceramic

Filter

CF2

Filter

Switching

Q31

25-54MHz

108-225MHz

225-406MHz

406-512MHz

764-1300MHz

1st IF

XF 1

2nd IF

21.4MHz

XF 2

20.945MHz

455kHz

3.3V

12.75MHz

X 1

11.0592MHz

X301

Data

PLL

Power

SQ IN

Filter SW

/AM/Digital

Mute

Keytone

3.3V

a Dat

Cont.Data

VR6b

VR6a

1st

Local

2nd

Local

Zeromatic

Switching

Q14,D23

Switching

Q13,Q17

2nd IF Amp

Q15,Q16

Detector,

Comparator

D27,28,IC3

2 SQ

B+ (3.3V)

LED Driver

Q301,302

303,305,306

LED

Reset

Q304

Switching

Q12

ont.

Scan C

Search Cont.

Switching

Q18,Q19

Power Save Cont.

ANT

DSP

IC310

Flash

Memory

IC311

CODEC

IC313

Voltage

Regulator

IC309

Voltage

Regulator

IC308

Shift

Resister

IC312

3rd Local

Swithing

IC9c,9d

Con

3rd Localt.

Voi

X302

18.432MHz

BLOCK DIAGRAM

TCXO

ALIGNMENT AND ADJUSTMENT

ALIGNMENT AND TEST POINT

ALIGNMENT PREPARATION

Test Equipment Required

zOscilloscope

zDC SSVM

zFM signal generator

zFrequency counter (800 MHz)

Notes:

zUse non-metallic tuning tools.

zThe test equipment and receiver should be warmed up for at least 10 minutes before proceeding with alignment.

zThe signal level from the generator should be kept as low as possible to obtain a usable output.

zTo tune the frequency, press TUNE, frequency number including decimal point, then press ENT.

If you make a mistake, press CL to delete a single digit or hold CL about 2 seconds to start over.

L26

L24

L23

TP1 TP2

TP3 TP6 TP5 TP4

VR2

VR4

VR5

VR3

Linear PCB

ALIGNMENT PROCEDURES

PLL2 VCO Alignment

PLL1 VCO1 Alignment

PLL1 VCO2 Alignment

Table 1

Figure 1 Figure 2

DC SSVM

TP2Unit

Under Test

DC SSVM

TP3Unit

Under Test

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Adjustment of Coils L23, L24, and L26

Notes:

zBe very careful when doing coil pitch adjustment

because it greatly affects the frequency.

zSecure the coil with glue after alignment. Be sure

the glue is dry and the coil is secured. Also, be

sure that the environmental temperature is nor-

mal. Then, repeat VCO (PLL2 and PLL1) align-

ments on Page 6.

Each coil should be adjusted carefully by changing

the pitch of the coil little by little using a non-metallic

tuning tool as shown in Figure 3.

Increase the pitch of the coil when the measured volt-

age at TP2 or TP3 is higher than the voltage listed in

Table 2 for the PLL2 VCO alignment, PLL1 VCO1 align-

ment, and PLL1 VCO2 alignment.

Decrease the pitch of the coil when the measured volt-

age at TP2 or TP3 is lower than the voltage listed in

Table 2 for the PLL2 VCO alignment, PLL1 VCO1 align-

ment, and PLL1 VCO2 alignment.

Figure 3

Table 2

Figure 4

Use

non-metallic

tuning tool

PCB

Coil

Frequency Counter

TP1

Unit

Under Test

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Reference Frequency Osc. Confirmation

Note: Care should be taken not to make any contact between TP1 and the shield case.

3rd Local Alignment

Frequency Counter

TP5

Unit

Under Test

ANT

FM Singal Generator

Figure 6

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Figure 5

FM Signal

Generator

ANT. Jack

Unit

Under Test

DC SSVM

TP4

455 kHz FM Discriminator Coil Alignment

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IF (380.8 MHz) Trap Adjustment

Signal Meter Alignment

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Generator

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ANT. Jack

Unit

Under Test

Oscilloscope

Headphone

Jack

FM Signal

Generator

ANT. Jack

Unit

Under Test

DC SSVM

TP6

Figure 7

Figure 8

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Power ON

Is the display

normal?

Is EEPROM check

program OK? Defective IC301.

Defective IC307, LCD

and/or associated

circuit.

Is the voltage

of TP2 about 18 V at

960 MHz?

Defective

PLL circuit

(IC4) or

VCO

circuit.

Proceed to Microprocessor

check.

YES

Power on the scanner.

Press 0while the scanner shows -Welcom To-

Object Oriented Digital Trunking RadioShack.

The scanner shows System Tests: Select a

Test... Exits if no key is pressed. Then press 5.

The scanner shows EEPROM Test Erase

Momory ENTER if APPROVE CLEAR to EXIT.

Then press ENT.

The scanner shows Testing, and automatically

starts the EEPROM test program.

The scanner initializes the working memory.

Is the voltage

of TP2 about 20 V at

1300 MHz?

Is the voltage

of TP3 about 2.0 V at

512 MHz?

YES

EEPROM check program

procedure as follows:

Note: This procedure clears all information you

stored in the scanner's working memory.

TROUBLESHOOTING

Reception Check

Does the

display work

properly?

YES

Does display

freeze showing Waiting

for DSP or DSP

Loder ....

Proceed to DSP

section (Boot

section) check.

YES

The scanner shows GLOB EEPROM area

initialized to defaults. Press any key. Then press

any key.

The scanner shows Initializing the File system

then File system initialized to defaults. Press any

key. Then press any key.

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